28C256 查看數據表（PDF） - Atmel Corporation
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28C256 Datasheet PDF : 14 Pages
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AT28C256
Page Mode Characteristics
Symbol
Parameter
Min
tWC
Write Cycle Time
AT28C256
AT28C256F
tAS
Address Set-up Time
0
tAH
Address Hold Time
50
tDS
Data Set-up Time
50
tDH
Data Hold Time
0
tWP
Write Pulse Width
100
tBLC
Byte Load Cycle Time
tWPH
Write Pulse Width High
50
Page Mode Write Waveforms (1, 2)
Max
Units
10
ms
3.0
ms
ns
ns
ns
ns
ns
150
µs
ns
Notes: 1. A6 through A14 must specify the same page address during each high to low transition of WE (or CE).
2. OE must be high only when WE and CE are both low.
Chip Erase Waveforms
tS = tH = 5 µsec (min.)
tW = 10 msec (min.)
VH = 12.0V ± 0.5V
2-223
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